I've flipped between 15" and 17" MBPs for years, but never before have I noticed such a striking difference between sound quality on a 17" vs. a 15". Had a 2.8Ghz 17", went to an i7 15" and found the sound incredibly weak. It could barely fill a hotel room. Moved back to a 17" i7 today and it's incredibly better, fuller and louder. Just an observation.